package com.sky.aspect;

import com.sky.annotation.AUtoFill;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.springframework.stereotype.Component;
import org.aspectj.lang.reflect.MethodSignature;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDate;
import java.time.LocalDateTime;

import static com.sky.constant.AutoFillConstant.*;

/**
 * 自定义切面，实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&& @annotation(com.sky.annotation.AUtoFill)")
    public void autoFillpointcut() {

    }
    @Before("autoFillpointcut()")
    public void autoFill(JoinPoint joinPoint) throws InvocationTargetException, IllegalAccessException {
        log.info("开始行进公共字段自动填充...");
        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature  signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
        AUtoFill autofill=signature.getMethod().getAnnotation(AUtoFill.class);//获得方法上的注解对象
        OperationType operationType = autofill.value();//获得数据库操作类型
        //获取当前被拦截方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if(args != null && args.length==0){
            return;
        }
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = System.currentTimeMillis();
        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if(operationType==OperationType.INSERT){
            //为四个公共字段赋值
            try {
                Method setCreatTime = entity.getClass().getDeclaredMethod(SET_CREATE_TIME, LocalDateTime.class);
                Method setCreatUser = entity.getClass().getDeclaredMethod(SET_CREATE_USER, Long.class);
                Method setupdateTIME = entity.getClass().getDeclaredMethod(SET_UPDATE_TIME, LocalDateTime.class);
                Method setupdateUser = entity.getClass().getDeclaredMethod(SET_UPDATE_USER, Long.class);

                //通过反射为对象属性赋值
                setCreatTime.invoke(entity,now);
                setCreatUser.invoke(entity, currentId);
                setupdateTIME.invoke(entity,now);
                setupdateUser.invoke(entity,currentId);
            } catch (NoSuchMethodException e) {
               e.printStackTrace();
            }
        }else if(operationType==OperationType.UPDATE){
            //为两个公共字段赋值
            try {
                Method setupdateTIME = entity.getClass().getDeclaredMethod(SET_UPDATE_TIME, LocalDateTime.class);
                Method setupdateUser = entity.getClass().getDeclaredMethod(SET_UPDATE_USER, Long.class);
                setupdateTIME.invoke(entity,now);
                setupdateUser.invoke(entity,currentId);
            } catch (NoSuchMethodException e) {
                e.printStackTrace();
            }
        }



    }

}
